The poll showed Brown leading Warren 49 percent to 44 percent, with a margin of error of plus or minus 4.5 percentage points.

A slew of opinion polls have been released in recent weeks, some showing Brown with a wider lead, others showing Warren ahead. Pollsters say their surveys reflect a moment in time, noting that voter opinions are subject to change. They also use differing methodologies.

Noah Bierman can be reached at nbierman@globe.com. Follow him on Twitter @noahbierman.